Feed collet and method of making the same



Mar. 27, 1923.

FILED FEB. Il. 1922.

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Mar. 27, 1923.

C. J. FANCHER ET AL'. FEED COLLET AND METHOD 0F MAKING THE SAME.

2 SHEETS-SHEET 2.

FILED FEB. ll, 1922.

Patented Mar. 27, l923.

CHARLES J. FANCHER AND ROBERT A. JOHNSON, OF WINDSOR, VERMONT, ASSIGNORS T THE NATIONAL ACME COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FEED COLLET AND METHOD OF MAKNG THE SAME.

Application led. February 11, 1922. Serial No. 535,709.

To all whom it may concern.'

Be it known that we, CHARLES J. FANcHnn and ROBERT A. JOHNSON, both citizens of the United States, residing at Windsor in the county of Windsor and State of Vermont, have invented certain new and useful Impovements in Feed Collets and Methods of aking the Same, of which the following is a specification. n

This invention relates to feed collets or pushers and to the method of making the same, an object thereof being to 'provide a sheet -steel or metal feed colletl adapted to .be `used particularly with` small sizes oif stock, and which will be relatively economicall and'easy to manufacture, durable and long lived, andd eflicient in use. The feed collets or pushers contemplated in this invention are adapted particularly for use in variousetypes of machines, such as'metal working machines including automatic or hand operated-screw machines, bar forming machines and the like, and constructed especially for the purpose of gripping and feeding the stock or work.

A. further object of this invention is to provide a sheet steel' or metal feed collet or pusher adapted for use in connection with any predetermined size of stock, the collet being constructed or produced from a socalled master collet of standard size, and formed by providing means for adjusting or varying the size of the gripping bore thereof to accommodate any predetermined size or shape of work. By virtue of this invention therefore, feed collets may be produced in large quantities in a single standard or v uniform construction or size, which may be readily and inexpensively adapted for use with stock of any size, diameter or shape merely by securin lwithin the gripping bore of the collet a `fi ler meansconstructed to form a gripping bore `of the desired diameter shape or size. i K

f ther `objects of this invention will appear fromthe following description thereof, reference being yhad to the accompanying drawingsforming a part of `this specification, wherein like reference characters indicate, corres onding parts -in rthe severa-l views, and w erein Fig.. lis a perspective view cfa; feedcolletmembodying; our` invention;v Fig. 2 is-a longitudinal .section therelcollets respectively.

of; Fi 3 is a cross section taken on line 3-3 o Fig. 2; Fig. 4 is a plan View illustrating by way of example, a form of blank from which the collet may be formed; Fig. 5 is a detail vie'w of a iiller adapted to be secured within the gripping bore of the collet; Fig. 6 is a side View'partly in section illustrating a modified form of our invention; Fig. 7 is a similar view illustrating a further modification; Fig. 8 is a similar view illustrating a still further modification; and Fig. 9 is an end view of the construction shown in Fig. 8.

The present improved feed collet as shown herein is formed or rolled up from a metal blank 9 struck from or stamped out from a piece of sheet metal, such as a pressed 'steel plate. The blank it will be noted comprises preferably a body portion 10, and a plurality of finger pieces 11 extending or projecttill ing from one of the .sides of the body. In

the present instance the finger pieces 11 have tapered formations and terminate in gripping portions 11a, but of course it-will be understood that the same may be shaped in any desired manner in accordance with the preferred shape or construction of the collet.

ln forming the master` feed collet, the blank 9 is formed or rolled up by the appli-v cation of suitable pressure into a shape substantially similar to that illustrated in Fig'. 1. The body part 10 is thus formed into a substantially tubular, hollow, or cylindrical form having a lengthwise extending nondrilled bore therethrough. rllhe contiguous edges 19 and 20 are then bent into juxtaposition and may, if desired, be connected ink any suitable manner, such fory instance as illustrated in our co-pending applications Serial No. '350,501 filed February 13, 1921, and Serial No. 417,646 led October 18, 1920, for feed collets, and method of making feed rThe finger pieces `11 may then be bent, pressed or otherwise forced .inwardly a suitable distance or shaped in any suitable manner so as tol form the gripping ngers 12, and the portions 11a V thereof are shaped in any preferred manner in the present instance theseportions form -a substantially cylindrical or 'tubular irough.

gripping end13 having a bore .thereA `lt willbevnoted thatthe' several. gripping. lingers 12 are highly, resilientand are sepa- SMP lil() lll rated by suitable lengthwise extending slots 1a, the gripping end being provided in the present instance with suitable slots 19a. In'

order to permit the attachment of the collet to the feed tube or other supporting member of the machine, the end of the collet is threaded as indicated at 15, and a shoulder 16 is formed vin a suitable manner. As shown in Fig. 4f, the blank 9 mav be offset at 17 to form such shoulders whereby upon rolling up or coiling the blank the exterior shoulder 16 will be provided. In this manner more metal vwill be left under the threads, thereby strengtheningthe body of gripping bore of the master collet, such in the present instance being in the form of a filler consisting of a plurality'of filler sections, /blocks or pads 18. As herein illustrated, each section or block 18 is segmental in formation, the outer surface being shapedl to conform to the inner surface of the end of each linger 12 and the inner surface being shaped to conform to the shape or size of the work.

Thus, it will be seen that the sections 18 may be readily welded or otherwise secured within the grippin bore of the collet to the fingers 12'," the sai bore 20a of any desired size, shape or form in conformance with the particular stock or work. The outer surfaces of the filler sections 18 are tapered at 21 so as to form a tapered opening, and* thus centralize the end of the stock .bar and so prevent the waste end of the stock from jamming the collet after the bar has been fed completely through the collet, wlQe the inner surfaces 2l.n are likewise tapered to facilitate the feeding of each newA stock bar into the collet by centralizing it.

In the modified form illustrated in Fig. 6, means is also provided for accommodating or adapting the collet to any predetermined size or shape of Work. In this instance the ends of the grippin fingers 12 are bent inwardly ,as indicate at 26 to form afiller comprising a plurality of sections or pads shaped to conform lto the shape `and size of the stock. Thus, these inwardly bent ortons 25 it will be noted are themselves ighly resilient, and hence in conjunction with the"` resiliency of the respective gripping fingers .1,2 will form gripping means of mcreased'resiliency, which may especially be adapted for particular forms of work.

sections thus forming a' ine-ence These gripping portions 25 furthermore are so constructed as to have inner and outer tapered faces 27 and 27a respectively, thus forming tapered openings for the purposes hereinbefore described. v

In the modified form illustrated yin Fig. 7 the gripping ngers 12 of the collet are provided with a filler likewise formed of filler sections or pads ,28, which are preferably hollow as indicated at 29, the same bein spot-welded as aty 30 to the ends of the ngers or secured in any other suitable manner. The sections 28 are also constructed sov as to have tapered faces 31 and 31a.

In the modified form illustrated in Fig. 8 the gripping fingers 12 are provided with an outwardly flaring filler also formed of sections, pads or blocks 32, a portion thereof extending into the bore of the collet and being spot-welded or otherwise vsecured thereto as at 34. The contiguous filler sections or members 32 are shaped to form a bore 33 of any preferred size, shape or form adapted to conform to the particular stock to be gripped and fed. The outer and inner yfaces of these members 32 are also machined as at 35 and 35al so as to form tapere openings. I 'f Thus, it will be seen that in this improvement the master collet is not only provided with means for varying the size or shape of the gripping bore, but also with means constructed to form a Haring working end, the tapered opening thereof having its greatest diameter greater than the diameter of the gripping bore of the collet.

s a result of the above construction, we have provided an improved feed collet formed from a metal blank bent or shaped into a hollow body having juxtaposed edges and a non-drilled bore, the collet having a gripping portion formed in several instances separate therefrom and secured to the' collet and provided with means for varying the gripping bore thereof to conformto any predetermined size or shape of stock.

From the foregoing it will be seen that this improvement comprises a master collet to which separable and interchangeable sectional filler blocks, pads or members mayfbe readil secured as for instance by spot welding igs. 1, 7 and 8). In other words, the

collets may be made of a predetermined 'size and by having interchangeable sizes and shapes of filler. members, the master collet hibits the integral formation of a filler Since "there isno metal from .whichl such filler could be formed. In our priorv case' herein- `obviously the thickness of this metalv pro'- mageos before referred to, it was necessary to shape the ends of the fingers to the desired diam' eter and shape of the bar. Consequently collets had to be made for each shape of bar and each diameter of bar within certain limits, but by the present improvement the master collet can be quickly adapted for use with various diameters and shapes of bars by using vthe particular size of filler re-v quired. lft will also be observed that in each instance the filler blocks' are inserted into the bore formed by the spaced fingers of the collet for even in Fig. 6 the filler member is bent inwardly and inserted into the end of the collet, although in this instance the filler member 1s not separatelyvformed as in all the other forms shown, and therefore this particdar form is not so desirable nor as practicable for interchangeable use as the form shown in Fig. 1.

Although we have described our invention in its preferred form, it will be understood that we do not limit ourselves to the construction herein shown and described, except in so far as defined in the claims and embraced within the scope thereof.

We claim as our invention.

l. A sheet metal feed collet comprising a body portion and a gripping portion having a bore therethrough, and an insertable filler means within saidggripping portion for varying the size of said' bore to accommodate varying sizes of work.

2. A sheet metalfeed collet comprising a body portion and a gripping portion havmg a bore therethrough, and an insertable sectional filler within said bore for varying the size thereof.

3. A sheet metal feed collet comprising a body portion and a gripping member extending therefrom'and having an interior diameter adapted to interchangeably receive diderent sizes of insertable filler sections adapted to be secured thereto and shaped to conform to the shape of the work.

d. A feed collet comprising a body portion, a' gripping portion extending therefrom, and insertable sectional filler means spot-welded to the inner face of said gripping portion for varying the sizeof the gripping bore therethrough.

5. A sheet metal feed collet comprising a body portion, spaced gripping lingers extending therefrom, and insertable means secured to said ngers and having gripping portions adapted to grip the work.

t. A sheet metal feed collet comprising a body portion and a resilient gripping portieri having a lengthwise extending bore therethrough, and insertable segmental filler means secured to said gripping portion within the bore for gripping the work and constructed to form a bore of reduced size.

7. A sheet metal feed collet comprising a metal blank bent or shaped into a hollow body having a lengthwise extending bore and a grlpping portion, and means secured i hereto for varying the size of the gripping ore. v

8. A feed collet comprising a. metal blank bent or shaped into avhollow body having a lengthwiseextending bore and a gripping portion, means secured to said gripping portion for reducing the size of the bore and haviqg an outwardly ared working end.

9. feed collet comprising a metal blank bent or shaped into a hollow body having a lengthwise extending bore and a grippmg portion, means secured to said gripping portion for reducing the size of the bore and having an inwardly flared inner end.

l0. A feed collet comprising a metal blank bent or shaped into a hollow body having a lengthwise extending bore and a gripping portion, means secured to said gripping portion for reducing the size of the bore and having inwardly and outwardly iared ends.

11. A feed collet comprising a hollow body having a lengthwise extending bore and a gripping member, and sheet metal means projecting into said bore and constructed to form a gripping bore of reduced size adapted to grip .the work.

l2. A feed collet comprising a sheet metal blank bent with the contiguous edges in position to form a bore therethrough and having a plurality of resilient gripping members, said collet having means at one end for attachment to its support, and insertable means secured to said gripping members and constructed to form a gripping bore of reduced size.

13. A sheet metal feed colilet comprising a body portion and a resilient grip-ping portion, and a filler member secured to said gripping portion and having an outer surface conforming to the inner surface of the gripping portion and an inner surface conforming Vto the shape of the bar to be fed.

1.4. A master feed collet formed from sheet metal and comprising a hollow body portion, and a hollow resilient gripping portlon having an insertable filler member therein and secured to the gripping portion thereby to lessen the diameter of the gripping portion of said master collet.

l5. A master feed collet comprising' a sheet metal blank bent or shaped into a hollow body portion and a hollow resilient gripping portion having an insertable filler member therein and secured to the gripping portion thereby to lessen the diameter of the gripping portion of said master collet, said filler member comprising a plurality of sectional members having flaring ends.

16. The method of forming -a collet, which consists in stamping from sheet metai a blank comprising a body. portion and 'projecting tapered finger pieces, then roling said blank into tubular form thereby to have titi juxtaposed edges, then compressing the linger pieces to form spaced resilient fingers, then securing a ller member to eachV of said fingers thereby to form a gripping bore therethrough. v

17. The method of forming a collet, which consistsv in stamping from-sheet metal a blarik comprising a body portion and a ^projecting portion, then bending said blank to forma hollow collet, and then securing to the inner face of said projecting member y gripp-ing means constructed to engage the Work. Y A y fr 18. The method of making a master feed collet, which consists in forming a tubular member comprising a body portion and a gripping portion of greater interior diameter than the stock to be fed, and then inserting into and spot Welding to said gripping portion a filler member .thereby to decreasey the diameter of said master collet.

19. The methodyof making a master feed l collet, which consists in forming from sheet metal a tubular member comprising a body i portion and a gripping portion of'greater' interior. diameter than the stock to be fed, and then. inserting into and securing to said gripping portlon a filler vmember thereby to decrease the diameter of said master collet, said filler member comprising a plurality of sections having an outer surface conforming toothe inner surface of the grip-ping portion of the master collet and an inner mentos .surface conforming to the shape of the stock to be fed 20. rThe method of\ making feed collects, which consists in first providing a master collet formed from sheet metal and comprising a body portion and a projecting gripping portion and of a size adapted for use With various sizes and shapes of stock, and then transforming said master collet into a specific feed collet adapted for a particular size and shape of stock by providing the gripping portion thereof with a filler.

2l. which consists inrst providing a master collet formed from sheet metal and comprising a body portion and a projecting gripping portion arid of a size adapted for use d5 'lhe method of 'making feed collets.,l

With various sizesand shapes of stock, and

then transforming said master collet into a specific feed collet adapted for a particular size and shape of stock by providing the grip-ping portion thereof With a filler comprising a plurality of sectional members having an outer face conforming to the inner face of the gripping portion and an inner face conforming to the shape of the stock and of a thickness to lessen the diameter of the master collet and also having flaring inner and outer ends. Signed at Windsor, Vermont, this 23rd day of Januar 1922.

Y C ARLES J. FANCHER.

ROBERT A, JOHNSON. 

